Causes

Hemoptysis refers to coughing up blood from some part of the lungs (respiratory tract). Blood coming from elsewhere, such as your stomach, can mimic coughing up blood. It's important for your doctor to determine the site of the bleeding, and then determine why you're coughing up blood.

The major cause of coughing up blood is chronic bronchitis or bronchiectasis. Other possible causes of coughing up blood include:

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